Automatic stop for talking-machines.



R. ;0. MAY. I 'AUTo flw STOP, TOR TALKING AOHIN S, APPLICATION FILEDmus, 1913. 1 AgfiflLW-l Patented Feb. 9, 1915.

2 sIiBnTs-sHBBT 1.

ATTORN EY nows'rnns. In; LIIM. PMs-human. u. c.

R. 0. MAY. AUTOMATIC STOP FOR TALKING MACHINES.

APPLICATION FILED MAY 5, 1913.

I Patented Feb. 9, 1915.

V 2 SHEETSSHEET 2.

WITNESSES ATTORNEY" RALPH OLIVER MAY,

or SALEM, INDIANA.

- AUTOMATIC STOP FOR TALKING-MACHINES.

' Specification of Letters Patent.

. Patented Feb; 9, 19115.

Application filed May 5, 1913. Serial No. 765,598.

mechanism being practically all below the level of the tablet.

In accordancewith the present invention the record carrying rotatabletable is controlled by an electrically operated brake and there is alsoprovided a contact member capable of being properly positioned withrespect to the record table by the placing of the latter on "the recordtable, so that when the terminal portion of the record groove isreached,'an electric circuit is established causing the actuation of thebrake and the stopping of the reproduction. \Vith the present inventionit is necessary to prepare each tablet with a small-perforation alwaysat a certaindistancefrom the termiao nal portion of the record grooves,and even though the position of this perforation with respect to theaxis of rotation be a variant, its'position with reference to theterminal portion of the record grooves is constant.

The invention will be best understood from a consideration of thefollowing detailed description, taken in connection with theaccompanying drawings forming a-part of this specification, with thefurther un-- derstanding that while the drawings show a practical formof the invention, the latter is not confined to any strict conformitywith the showing of the drawings, but may be changed and modified solong as such changes and modifications mark no material departure from,the salient features of the invention.

In the drawings :-Figure 1 is a plan view, partly broken away and partlyin section, of a record receiving table of a talking machine equippedwith the present invcntion. Fig. 2 is a vertical section on a largerscale than-Fig. 1 showing some nearer parts in elevation, with therecord holding table and a disk record tablet thereon in diaietricsection. Figs. 3 and 4 are more or less diagrammatic views showingportions of the tablets with sound records of different lengths thereonto illustrate the positionmg of the perforation in the tablet. Fig. 0 5is an elevation of a sound box arranged for use in connection' with thepresent invention.

Referring to the drawings, there lS-ShOWIl a table 1 mounted upon aspindle 2 and deas signed to receive and support a disk'record tabletindicated at 3, the tablet being omitted from the showing of Fi'gr'lrThe parts are assumed to be'mounted upon-aesuitable support usually inthe form of a cabinet,

the top portion of which is shown at 4 in Fig. 2 and this cabinet may beconstructed-- asis customary 'in the talking machine art. The table l-isprovided with a marginal flange 51extending toward the top 4:, which inthe normal position of the parts is,down-' ward, it being customary tohavethe table 1 horizontal and the spindle 2 upright. There is thereforesome l ttle space between the under surface of the table 1 and thetop soof the cabinet, this space\being ample for the location of certain partsto be described. Mounted on the rope is a plate (3 which may also serveas a support foran electromagnet 7. This plate carriesa lever 8 by 5means of an upright-pivot pin 9, the lever havingnear one end anarmature 10. inposition to be acted upon by the core of theelectromagnet 7; this core being indicated atll. The armature 10 ismounted. on thego short arm of the lever in the particularstructureshown, while the longer arm extends to within close. relation to theinner face of the flange 5 and thereis provided with some frictionmaterial indicated atlQ, 1 this friction material being usually a padofleather or some other substance customarily employed in the talking"mhchine art for braking purposes. In the .path of the shorter arm of thelever is a stop pin 13, eg and this pin carries a spring 14 which may bea leaf spring with its free end in engagement with the lever, so thatordinarily the brake lever 8 isheld with its armature 10 away from themagnet and its table engaging end 12 out of contact with the inner wallof the flange 5, but near enough thereto so that on the energizationofthe m'agnet 7 and the rocking of the lever 8 by the action. of thecore 11 on the armature 10,

the pad 12 is brought into engagement with the inner face of the rim ofthe table and serves to stop its rotation, this action being augmentedby the cam relation of the end 12 of the lever 8 with respect to theinner face of the table 1 and the pin 9, for the distance between thepin 9 and the inner face of the table 1 on a' radial line is less thanthe length of the longer arm of the.

- being in the form of an eye which fits snugly on the spindle and yetmay be moved about the same on the application of archtively smallforce. The arm ltl'at the free end is connected by a pivot 20 to one endof another arm 21, which at the other" end is provided with a pin 22 ofa length to rise above the top of the table 1 and to project through aperforation 23 in the tablet 3, the pin 22 rising for anappropriatedistance .above the upper face of the tablet 3 when lodged on the table1 for a purpose to be described.

lhe tablets 3 of the disk type as used on talking machines have thesound record in the form of grooves 24 on one or both faces, and thesegrooves are really a continuous spiral groove from near the outer marginof from the center of the record tablet to a point near the centralportion of the tablet, which is customarily depressed, as indicated at25, and there carries the usual label. The record groove begins atapproximately the same distance from the outer margin of the tablet'mall record tablets, but because of different lengths of compositionsrecorded the inner margins may terminate at various distances from thedepressed portion For reasons which will presently appear theperforation 23 should be at substantially the same distance from theinner edge of the surface covered by the record groove 21, so that thisperforation may be at different distances the tablet and two suchpositions are shown in Figs. 3 and 1.

In Figs. 2 and 5there is shown a'sound box 26 without any attempt toillustrate any particular construction of sound box, so that the showingmay be taken as typical of any of the various sound boxes employed indisk talking machines. The sound box is provided with a needle arm 27terminating in the usual socket portion 28 carrying a thumb screw 29designed to clamp a reproducing stylus 30 in place, these features allbeing common to various types of sound boxes. The socket portion 28 hasa contact finger 31 fast thereto, this contact finger being of anysuitable type, say, in the form of a fiat piece of metal which may evenbe a light spring finger, its-purpose being to engage the pin 22 whenthe stylus 30 has reached the tcrmi nal portion of the record groove, itbeing customary to provide two or three blank turns of the groove at theend of the por tion of the groove representing sound waves, so that thelocation of the perforation 23 for the pin 22 may be at a little lessthan the length of the contact finger or spring 31 from the groove zoneto cause contact of these-parts after the sound record containingportion of the grooves has been completed.

'lhe sound box 26 is connected to a conductor 32which may be carried toa battery 3 or other suitable source of current, a

single cell of dry battery being usuallysul'li- 'the eiectromagnet 17,while the other side of this electromagnet is connected by a conductor35 to the pin or screw 15.

To reproduce a sound record, the record tablet is placed upon the table1 so that the pin 22 will pass through the perforation 2:1, and becauseof the pivotal connection between the members 19 and 21 of the armcarrying the pin 22 the usual center hole of the record tablet is easilyplaced so as to be traversed by the arbor 2 where it projects above thetable 1. The stylus 30 is now placed at the proper position to beginreproducing the record and since the circuit charged by the batteryis'broken, the magnet 7 is not energized and consequently the spring 11forces the brake lever 8 out of engagement with the table 1. '1 herecord is reproduced in the usual way until finally the terminal portionof the record is reached, when the needle arm 27 to the socket member26,

thence by way of the finger 31 to the pin 22, thence by way of the arms21 and lllto the arbor 2, thence by the brush 16 to the screw or pin 15,thence by way of the conductor 35 to the electromagnet 7 and back to thebattery 38 by way of the conductor The magnet 7 is at once charged andcauses a movement of the lever 8 by thenttractiou of the core 11 for thearmature 10 and the end 12 of the brake lever 8 is carried (intoengagement. with the inner wall of the marginal flange of the table 1,while the continued rotation of the table 1 underits momentum will bringthe brake lever 8 into firm engagement with the table, thereby arrestingits movement. By making the finger 31 in the form of a light spring itmay snap past the pin 22 but the time of contact and pull the brakelever 8 into engagement With the table, of the table only serves to morefirmly engage the brake leverovith' it to arrest the movement of thetable.

IVhen talking machines are equipped With.

the present invention it is an easy matter to lay out and bore smallholes through tablets already in existence,- and it is likewise an easymatter to provide for the production of the holes 23 in new recordtablets as they are manufactured, since a pin properly located in thematrix from which the record is pressed will produce the hole, or themanufacturer may cause the hole to be bored in the finished record atthe proper distance from the inner margin of the zone occupied by thesound record groove. The brake is very readily disengaged from bindingaction with the table 'by a. slight reverse movement of the latter, thespring 1% then returning the brake lever. to its normalinactiveposition, so that the machine is ready for the reproduction ofanother record It is quite feasible, therefore, that the brake lever Ssupplant the ordinary stopping brake either actually or in function.

Since the pin 22 and the arms 19 and 21 rotate with the table 1 they maybe in almost anypos'ition about the spindle 2With respect to theoperator of the machine, and it would therefore be difficult to so placethe tablet 3 that the perforation 23 would readilyv coincide with thepin 22 when the tablet is placed upon the table 1. This difficulty isovercome by the fact that the pin 22 may be moved to any desiredposition about thespindle 2 with respect to the operpositions of theperforations 23 in different record tablets. lvforeover, the carrier forthe pin 22 if mounted wholly on top of the table 1 is very readily movedfrom one position' to another and so far as the table is concerned hasuniversal movement in the plane of the table top.

What is claimed is 1. In a sound reproducing machine, a rotatable tablewith a depressed central portion, a member movable across the table,anelectroanagnetically operated brake for the table. and a circuitcontroller for the brake comprising a contact member carried. by thetable within the depressed portion and ha ving a part rising therefromabove the plane of the top of the table, and another contact and anyfurther movement mounted on the table in the vmember carried by themember movable across the table and arranged to engage the first-namedcontact member atone limit-of travel of said secondcontact member.

2. In a sound reproducingmachine, a rotatable table, a brake for thetable,'electromagnetic means for operating the brake, a

contact, a flexible support therefor mounted directly onv the rotatabletable and constructed for universal movement parallel with the table, amember movable over the table transversely thereof, and another contactmember carried by the last-named memher and movable therewith into andout of V engagement with the first-named contact.

3. In a sound reproducing machine, a rotatable table, a brake locatedbeneath the table in position to engage the latter,electromagnetic meansfor operating the brake, a contact pin a-nd niounting therefor carriedWholly and directly by the table on top of the latter-and constructed tomove in all directions parallel with the table, said contact pin beingelectrically connected to the electrdmagnetic brake operating means, amember movable across the table abovethe same, a' contact carried by thelast-named member, and electric connections between the last-namedcontact member and the brake operating means. i

at. The combination of a rotatable memher having a centrally locateddepressed portion, a supporting spindle for the rotatablemember-projecting above the same, a brake lever located below therotatable member in position to engage the marginal portion thereof andhaving-a normal tendency toward the inactive position, an electro-magnetfor moving the brake lever to the active position and having connectionson one side to the spindle, a flexible arm carried by the -spindle andin electrical connection with the spindle above the rctatable memberWithin the depressed portion and having at the end remote from thespindle an upstanding pin of a height to extend above the surface of therotatable member, another member movable over the rotatable membertransversely thereof, an electric contact carried by the transverselymovable member, and electric connections from the last-named contact tothe electro-magnet'j for causing the energization of the lectro-magneton the engagement of the said contact with the said pin.

5. In a sound reproducing machine. a sub stantially flat rotatable tablehaving a central depressed portion, a contact member depressed portionthereof andconstructed to move in all directions therein and \having a'portion of a-lepgth to extend above the surface of the table, anothercontact mounted for movement across the table into position to en gagethe first-named contact, and an electremagnetic brake controlled by thecontacts.

(Lg-In a sound reproducing machine, a substantially flat table mountedfol-rotation uponta substantially upright axis and pro.- Vided with acentrallyv disposed depressed portion in 'its upper face, a brake arrangedv'in operative relation to the table,

electro-magnetic means for operating the brake,- a jointed arm mountedon the table in the depressed portion and movable about the axisof 'saidtable, a pin carried by the of the jointed arm remote from the axis ofthe table, and a, contact movable over the table into position to engagethe pin, the said movable contact and pin being electrically connectedto the electromagnetic brake operating means.

In testimony, that I claim the foregomg as my own, I have hereto afiixedmy signa-

